From 0cf94c6a60d6939404e2c83241ad89382238aab2 Mon Sep 17 00:00:00 2001
From: Stanislav Mykhailenko <mykhailenkostanislavzno@gmail.com>
Date: Tue, 10 Jan 2023 19:26:56 +0200
Subject: [PATCH] Add Lesson 8 Task e1900ba2

---
 Lesson_8/We know/sha256_crack.py | 35 ++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 Lesson_8/We know/sha256_crack.py

diff --git a/Lesson_8/We know/sha256_crack.py b/Lesson_8/We know/sha256_crack.py
new file mode 100644
index 0000000..f49c113
--- /dev/null
+++ b/Lesson_8/We know/sha256_crack.py	
@@ -0,0 +1,35 @@
+# Lesson 8 Task e1900ba2: SHA-256 crack (?)
+# Author: Stanislav Mykhailenko
+# License: Unlicense
+
+# Return codes:
+# 0 - OK
+# 1 - Invalid hash
+# 2 - Not cracked
+
+import hashlib, itertools, sys
+
+def hashError():
+	print("Invalid SHA-256 hash.")
+	sys.exit(1)
+
+crackedHash = input("Enter SHA-256 hash: ")
+
+if len(crackedHash) != 64:
+	hashError()
+
+try:
+	int(crackedHash, 16)
+except ValueError:
+	hashError()
+
+for product in itertools.product('abcdefghijklmnopqrstuvwxyz', repeat=4):
+	string = ''
+	for i in range(len(product)):
+		string += product[i]
+	if crackedHash == hashlib.sha256(string.encode('utf-8')).hexdigest():
+		print("Cracked: " + string)
+		sys.exit(0)
+
+print("Not cracked.")
+sys.exit(2)